Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73630edcf2e1c7f…

MALICIOUS

PDF

81.7 KB Created: 2021-06-27 16:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 07112609efbff3fd87fb49c4db4cd988 SHA-1: c8b83bf8500b88868a98a7c7896bf50f534906cf SHA-256: a73630edcf2e1c7f3a01c8f3e3314ab5d2104e9b976d3a2f7e655e0dac8eef58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains. These links are designed to redirect users to potentially malicious content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=tommy+shaw+boat+on+the+river PDF link annotation
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/54fingqgjbd2tmjoqsmktuikd1/kamogakidemozonegafum.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ndgg8109cb8t8nifq92lhtr20g/xadeforutorekutute.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a315a880c65ef0cc793e406df3bd59d5/91916632263.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/726bd58f21e01ec761ed65e2cf4bc1ad/nipepizafox.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/0d642914f8f7394c155324e9399edb7e/18130151974.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/98362137274.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/70810dbcc003a46e293e038f11de3d27/14200890401.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/81fe3a4262c2ccd63bea68ef1e712c4c/11245383884.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/skbop6vncrjcldg7ns65nmkl4u/sizagezed.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8af85789deb74b73bdde9c9acb0dd55e/36990563551.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac5630ab525---vorom.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086560b7bc59---40744833989.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c559b798fed34ffbb969b2cf77f0345b/dufupilakudizu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8a101ea27---9479118497.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/79513335386.pdfIn PDF document text
    • http://renovator.cz/files/file/kugaxuziru.pdfIn PDF document text
    • http://vhktn.at/images/content/files/109441304.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/anj1am0b7ml2pse5rvccv3p8cd/luriwenazuseguxunexa.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ae3gnei8546vclhac2fbi3sjh3/17588246075.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/65a7f8265f3d497597b7da2f22ff4f50/redet.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/65a1d6e20111a51533961628f3278c5a/xoposorud.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4cdd3e5f---mumijutotonokowo.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/dujuletit.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/medadaxixesafugizavotabof.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 17028 bytes
SHA-256: e092fbe9fd995998aaa9c3762b104ea59459a0d30a02f7de5da6a8178bdcec4c
font_02_sfnt_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 10696 bytes
SHA-256: f6bca2cbac132e6f1c344035fe8e77395ed30a85f0272bb51637bbc3e0d6c6ef
font_03_sfnt_off0001231d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231D 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f

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